Dodgy diesel-heads to the bridge please

http://blogs.reuters.com/breakingviews/2015/09/30/vws-dodgy-diesel-gains-a-measly-4-3-bln-euros/
There have been lots of articles on the fact that a gadget has been installed that cheats exhaust emissions when detecting if the vehicle is on a rolling road.
So the questions are :-
how does it detect when it's on a rolling road?
how does it baffle the scientific instruments that have been used to detect ACTUAL levels of N0 and C02?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

This has been answered a number of times recently.

It doesn't. It just retunes the engine to emit lower levels.
--
"Freedom is sloppy. But since tyranny's the only guaranteed byproduct of
those who insist on a perfect world, freedom will have to do." -- Bigby Wolf
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Tue, 6 Oct 2015 14:43:16 +0100, "Bertie Doe"

I don't know how VW did it, but if there is an accelerometer attached to the EMU, and the road wheels were belting along with no significant acceleration, you can be fairly certain you're on a treadmill.

But that's the point, in this condition the emissions are compliant.
--

Graham.

%Profound_observation%
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Graham. wrote:

But the power output is not acceptable to the driver/marketplace if they were left like that.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 06/10/15 14:43, Bertie Doe wrote:

a) It could spot trivial stuff like the steering's not being used, one set of wheels is not rotating (ABS sensors), a particular pattern of throttle applications and stuff like that. Who knows what they actually did, but it seems possible.
b) Fiddle with the fuelling and air to get a cleaner exhaust (for some definition of clean) at the expense of power or efficiency.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 06/10/2015 3:19 PM, Tim Watts wrote:

When I first heard about the 'dodge' I assumed the EMU would be well aware of any load or, draw being put on it's pins?
--
One click voting to change the world.
.<https://secure.avaaz.org/en/index.php
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 06/10/15 20:40, RayL12 wrote:

Er, no, but what has that got to do with it anyway?
--
Global warming is the new Margaret Thatcher. There is no ill in the
world it's not directly responsible for.
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 06/10/2015 9:12 PM, The Natural Philosopher wrote:

I'm assuming that a machine is plugged into the EMU and that the EMU does the 'modifying'?
--
One click voting to change the world.
.<https://secure.avaaz.org/en/index.php
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 06/10/15 21:23, RayL12 wrote:

asumptions totally wrong
Carr is put on a rolling road and a sniffer shoved up its tailpipe
--
Global warming is the new Margaret Thatcher. There is no ill in the
world it's not directly responsible for.
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 06/10/2015 14:43, Bertie Doe wrote:

Who cares?
September car sales were at record levels. The VW Golf was the 4th best seller and the VW Polo was 5th.
--
Michael Chare

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Well you would not be steering much on a rolling road. As for baffling, the engine management can no doubt select a running mode with very low emissions once its been running for a while, but normal driving is dynamic and presumably cannot be tracked fast enough to stop it exceeding the no doubt daftly low amounts in the spec. This is my version of what a wheel in expert from one of the motoring organisations said in a phone in. Brian
--
From the Sofa of Brian Gaff Reply address is active
Remember, if you don't like where I post
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 06/10/15 19:42, Brian-Gaff wrote:

Not at a;ll. ECU responds in milliseconds.
That's not the problem. The problem is that low NOx equates to a richer mixture, which screws the fuel consumption in cruise and at idle.
And its not the best for peak power either..
--
Global warming is the new Margaret Thatcher. There is no ill in the
world it's not directly responsible for.
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 06/10/15 19:50, The Natural Philosopher wrote: <snip>

These are diesels: how do you define a rich or lean mixture for combustion occurring on the surface of many tiny droplets?
At any condition other than peak fuel demand, a diesel operates with considerable excess air, because the inlet air is not throttled.
--
Kevin

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 07/10/15 22:28, Kevin wrote:

By injecting more or less fuel, obviously.

That is not the point. And its not true of variable geometry turbo charged diesels either.
They operate with variable amounts of air.
And its not true across the whole combustion chamber either. Timing of injection pulse(s) makes a big difference, as does the swirl patterns of the airflow.
Essentially shoving fuel in at the point where peak temperature and pressure coincides with TDC gives the most power and econony at any given throttle setting, and the most NOx.
--
Global warming is the new Margaret Thatcher. There is no ill in the
world it's not directly responsible for.
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 08/10/2015 01:36, The Natural Philosopher wrote:

You sure about that? Don't they need injection advance, the way petrol engines have ignition advance?
Andy
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 09/10/15 21:07, Vir Campestris wrote:

Where did I say that injection time corresponds to peak pressure and temperature?

--
Global warming is the new Margaret Thatcher. There is no ill in the
world it's not directly responsible for.
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 09/10/2015 21:31, The Natural Philosopher wrote:

Or indeed any injection at all.
This bit does give it away "shoving fuel in at the point where peak temperature and pressure coincides with TDC", does imply that if there is any "injection" that its at a point coinciding with TDC.
If that wasn't what you intended to say, where injection isn't the same as "shoving fuel in", then perhaps you can enlighten us?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 09/10/15 22:26, Fredxxx wrote:

Perhaps saying 'shoving fuel in at such a point so as to make peak pressure and temperature coincide with TDC...'
but its a lot of extra words
--
Global warming is the new Margaret Thatcher. There is no ill in the
world it's not directly responsible for.
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 09/10/2015 22:48, The Natural Philosopher wrote:

But quite simply that isn't the case, as Andy was eluding to.
Fuel takes time to burn, it doesn't spontaneously explode when "shovelled in" or even "injected".
Therefore even diesel injection is carried out before TDC, in a similar way petrol engines have ignition advance.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 09/10/15 22:59, Fredxxx wrote:

Exactly.
I don't see what point you are trying to make, other than you are unable to understand technical english...
--
Global warming is the new Margaret Thatcher. There is no ill in the
world it's not directly responsible for.
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.